Rivian CAO has 42K shares withheld for taxes

Rhea-AI Filing Summary

Rivian Automotive, Inc. (RIVN) reported that Chief Administrative Officer Michael John Callahan had 42,082 shares of Class A Common Stock withheld on August 15, 2026 to satisfy tax withholding obligations tied to the vesting of 82,704 Restricted Stock Units at a reference price of $15.36 per share.

After this tax-withholding disposition, Callahan directly holds 1,031,776 Class A shares.

Insider Trade Summary

Tax Withholding: 42,082 shares

Tax Withholding 1 txn

Insider CALLAHAN MICHAEL JOHN

Role Chief Administrative Officer

Type	Security	Shares	Price	Value
Tax Withholding	Class A Common Stock F1, F2	42,082	$15.36	$646K

Holdings After Transaction: Class A Common Stock — 1,031,776 shares (Direct)

Footnotes (2)

1. F1. 42,082 shares of Class A Common Stock were withheld by the Company for the purposes of satisfying tax withholding obligations in connection with the vesting of 82,704 Restricted Stock Units on August 15, 2026.
2. F2. The closing price of the Issuer's Class A Common Stock on August 14, 2026.

Key Figures

Shares withheld for taxes: 42,082 shares Reference share price: $15.36 per share RSUs vested: 82,704 Restricted Stock Units +1 more

4 metrics

Shares withheld for taxes 42,082 shares Class A Common Stock withheld to satisfy tax withholding obligations on August 15, 2026

Reference share price $15.36 per share Closing price of Class A Common Stock on August 14, 2026 used for the withholding

RSUs vested 82,704 Restricted Stock Units RSUs vesting on August 15, 2026 that triggered tax withholding

Shares owned after transaction 1,031,776 shares Direct holdings of Class A Common Stock after the tax-withholding disposition

Key Terms

Restricted Stock Units, tax withholding obligations, withheld by the Company

3 terms

Restricted Stock Units financial

"in connection with the vesting of 82,704 Restricted Stock Units on August 15, 2026"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"for the purposes of satisfying tax withholding obligations in connection with the vesting"

withheld by the Company financial

"42,082 shares of Class A Common Stock were withheld by the Company"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did RIVN report for Michael John Callahan on August 15, 2026?

Rivian (RIVN) reported that Michael John Callahan had 42,082 shares of Class A Common Stock withheld to cover tax withholding obligations from the vesting of 82,704 RSUs on August 15, 2026, rather than an open-market trade.

How many Rivian (RIVN) shares does Michael John Callahan hold after this Form 4 transaction?

After the reported transaction, Michael John Callahan directly holds 1,031,776 shares of Rivian Class A Common Stock. This figure reflects his position following the 42,082-share tax-withholding disposition linked to RSU vesting on August 15, 2026.

What was the price used for the tax-withholding shares in the RIVN Form 4 filing?

The shares withheld for taxes were valued at $15.36 per share, described as the closing price of Rivian’s Class A Common Stock on August 14, 2026, which was used to determine the value of the 42,082 withheld shares.

How many Restricted Stock Units vested for Michael John Callahan in Rivian (RIVN)?

A total of 82,704 Restricted Stock Units vested for Michael John Callahan on August 15, 2026. To satisfy associated tax withholding obligations, Rivian withheld 42,082 shares of Class A Common Stock from the vested amount.

Was the August 2026 RIVN insider transaction a market sale by Michael John Callahan?

The Form 4 characterizes the event as a tax-withholding disposition, not an open-market sale. 42,082 shares were withheld by Rivian to satisfy tax obligations arising from the vesting of 82,704 RSUs, leaving Callahan with 1,031,776 shares.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/18/2026 - 05:25 PM EDT Accepted by SEC EDGAR 08/18/2026 - 05:24 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

CALLAHAN MICHAEL JOHN

(Last) (First) (Middle)

C/O RIVIAN AUTOMOTIVE, INC.

14600 MYFORD ROAD

(Street)

IRVINE CALIFORNIA 92606

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Rivian Automotive, Inc. / DE [ RIVN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Administrative Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/15/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	08/15/2026		F		42,082(1)	D	$15.36(2)	1,031,776	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. 42,082 shares of Class A Common Stock were withheld by the Company for the purposes of satisfying tax withholding obligations in connection with the vesting of 82,704 Restricted Stock Units on August 15, 2026.

2. The closing price of the Issuer's Class A Common Stock on August 14, 2026.

Remarks:

	/s/ Jamie Chung, Attorney-in-Fact	08/18/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)